2-acetoxybenzyl acetylsalicylate



Patented June 21, 1949 2,474,005

UNITED STATES PATENT OFFICE 2 -ACETOXYBENZY L ACETYLSALICYLATE Gustav J. Martin and Harold Urist, Philadelphia, Pa., assignors to The National Drug Company, Philadelphia, Pa., a corporation of Pennsylvania No Drawing. Application January 14, 1947, Serial No. 722,079

2 Claims. (01. 260-474) It is an object of this invention to produce a The compound of this invention may be adminnew analgesic having substantial effectiveness istered orally, in the form of a powder, solution, overa prolonged period. As iswell known, aspirin or tablets. It has excellent analgesic properties and related analgesics are efiective for but short and is unusual in that these properties last from periods of time, and as aresult they must be taken 5 five to ten times as long as those of aspirin or frequently if they are to serve the desired pursimilar analgesics. pose. This compound has the following structural We have found that the 2-acetoxybenzyl acetylformula: calicylate has analgesic properties superior to O aspirin and related materials of this type, and g more importantly, these properties are effective from five to ten times as long as analgesics heretofore employed. II

This material may be prepared by the conden- CHO C sation of acetyl saligenin with acetyl salicyloyl chloride in pyridine solution. For example, to a E cold solution of 16.1 grams mole) of acetyl saligenin may be added cos. of anhydrous As many apparently widely different embodipyridine and mole of acetyl salicyloyl chloride. ments of this invention may be made without de- The addition may be made over a period of 15 2o parting from the spirit and scope hereof, it is to minutes, with stirring. Stirring is continued for be understood that the invention is not limited an additional minutes and the solution is alto the specific embodiments hereof, except as delowed to stand over night at room temperature. fined in the appended claims.

The reaction mixture may be dissolved in ethyl We claim:

acetate and washed with 10 per cent hydrochlo- 25 1. A process which comprises reacting acetyl ride, water, 10 per cent potassium bicarbonate. saligenin with acetyl salicyloyl chloride in the water, and finally dried over sodium sulfate. The presence of pyridine, and separating the resulting solvent may be distilled in vacuo and the residue 2-acetoxybenzyl acetylsalicylate from the reacdried in vacuo. From this reaction there will be tion mixture.

obtained about 23.2 grams of a brown oil, amount- 30 2. 2-acetoxybenzyl acetylsalicylate.

ing t a y d of .8%. GUSTAV J. MARTIN.

Upon analysis the product was found to contain HA URIST 8.87 cc. of N NaOH for 1 gram of compound. The

theoretical would be 9.14 cc. of N NaOH for com- REFERENCES CITED plate hydrolysls of gram of compound Thls The following referenlces are of record in the corresponds to a purity of about 9'1 per cent. me of this patent, It is to be understood that the conditions of the foregoing reaction may be varied without depart- Chemlsche Zentralblatt II pa ing from the scope of this invention. In the light 25 cilavallx et D? n Patent of the instructions heretofore given such varia- 40 Ofiic Sc1ent1fic Libra y, Wa tions would be obvious to one skilled in the art. 

